JP2000205356A5 - - Google Patents

Description

（１）ケーシングの内部に該ケーシングの内径より外径が小さい内筒を設け、該内筒の内側をシリンダ孔とし、該内筒の外周面とケーシングの内周面との間に高圧油室に連通し得る低圧油室を形成し、該低圧油室の上部に高圧ガス室を設ける。 (1) An inner cylinder having an outer diameter smaller than the inner diameter of the casing is provided inside the casing, the inside of the inner cylinder is used as a cylinder hole, and a high-pressure oil chamber is provided between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the casing. A low-pressure oil chamber that can communicate with the low-pressure oil chamber is formed, and a high-pressure gas chamber is provided above the low-pressure oil chamber.

（２）ケーシングの内部に該ケーシングの内径より外径が小さい内筒を設け、該内筒の外周面とケーシングの内周面との間をシリンダ孔とし、該内筒の内側に高圧油室に連通し得る低圧油室を形成し、該低圧油室の上部に高圧ガス室を設ける。 (2) An inner cylinder having an outer diameter smaller than the inner diameter of the casing is provided inside the casing, a cylinder hole is formed between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the casing, and a high-pressure oil chamber is provided inside the inner cylinder. A low-pressure oil chamber that can communicate with the low-pressure oil chamber is formed, and a high-pressure gas chamber is provided above the low-pressure oil chamber.

（３）ピストン部の内部に高圧油室に連通し得る低圧油室を形成し、該低圧油室の上部に高圧ガス室を設ける。 (3) A low-pressure oil chamber that can communicate with the high- pressure oil chamber is formed inside the piston portion, and a high-pressure gas chamber is provided above the low-pressure oil chamber.

Claims (4)

ケーシングに設けられたシリンダ孔に対してプランジャに設けられたピストン部が進入し、該シリンダ孔とピストン部の端面との間に高圧油室が形成された油圧式オートテンショナにおいて、前記プランジャに設けた被圧面と前記ケーシングとの間にリターン用高圧ガスを封入した高圧ガス室を設け、該被圧面にかかるリターン用高圧ガスの圧力によりプランジャをケーシングから退出する方向に付勢することを特徴とする油圧式オートテンショナ。  A hydraulic auto tensioner in which a piston portion provided in a plunger enters a cylinder hole provided in a casing and a high-pressure oil chamber is formed between the cylinder hole and an end surface of the piston portion. A high-pressure gas chamber filled with return high-pressure gas is provided between the pressure-receiving surface and the casing, and the plunger is biased in a direction of retreating from the casing by the pressure of the return high-pressure gas applied to the pressure-receiving surface. Hydraulic auto tensioner to perform. 前記ケーシングの内部に該ケーシングの内径より外径が小さい内筒を設け、該内筒の内側を前記シリンダ孔とし、該内筒の外周面とケーシングの内周面との間に前記高圧油室に連通し得る低圧油室を形成し、該低圧油室の上部に前記高圧ガス室を設けた請求項１記載の油圧式オートテンショナ。An inner cylinder having an outer diameter smaller than the inner diameter of the casing is provided inside the casing, the inside of the inner cylinder serves as the cylinder hole, and the high pressure oil chamber is provided between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the casing. 2. A hydraulic auto tensioner according to claim 1, wherein a low pressure oil chamber that can communicate with said high pressure gas chamber is formed above said low pressure oil chamber. 前記ケーシングの内部に該ケーシングの内径より外径が小さい内筒を設け、該内筒の外周面とケーシングの内周面との間を前記シリンダ孔とし、該内筒の内側に前記高圧油室に連通し得る低圧油室を形成し、該低圧油室の上部に前記高圧ガス室を設けた請求項１記載の油圧式オートテンショナ。An inner cylinder having an outer diameter smaller than the inner diameter of the casing is provided inside the casing, the cylinder hole is formed between the outer peripheral surface of the inner cylinder and the inner peripheral surface of the casing, and the high-pressure oil chamber is formed inside the inner cylinder. 2. A hydraulic auto tensioner according to claim 1, wherein a low pressure oil chamber that can communicate with said high pressure gas chamber is formed above said low pressure oil chamber. 前記ピストン部の内部に前記高圧油室に連通し得る低圧油室を形成し、該低圧油室の上部に前記高圧ガス室を設けた請求項１記載の油圧式オートテンショナ。The hydraulic auto tensioner according to claim 1, wherein a low pressure oil chamber capable of communicating with the high pressure oil chamber is formed inside the piston portion, and the high pressure gas chamber is provided above the low pressure oil chamber.